JPH056737A - Multistage type collector body structure for microwave tube - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention has a long creepage distance for withstanding voltage,
Moreover, it is an object of the present invention to provide a multi-stage collector structure of a microwave tube which can be made lightweight. A multistage collector structure for a microwave tube according to the present invention comprises a plurality of electrode columns 15 to 17 for electrically insulating and holding a plurality of collector electrodes 21 to 24. Of these collector electrodes, at least every other collector electrode is held, and the other electrode columns hold the remaining collector electrodes, so that the above object can be achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave tube multistage collector structure suitable for use in traveling wave tubes, klystrons and the like.

[0002]

2. Description of the Related Art Generally, in a microwave tube, a high frequency acting section such as a slow wave circuit and a collector structure are arranged downstream of an electron beam in an electron gun section. For example, a traveling wave tube mounted on an artificial satellite employs a multi-stage collector structure in which a collector potential is lowered to operate in order to improve power utilization efficiency.

This type of collector structure is conventionally constructed as shown in FIG. 4, and has a plurality of collector electrodes 1, 2, 3, 4.
Are fixed to a plurality of electrode columns 6, 6 ... In which a plurality of insulating cylinders 5 such as ceramics are stacked, and are electrically insulated from each other and stacked. In this case, each of the collector electrodes 1, 2, 3, 4 has a flange portion 1 as shown in FIG.
The flange portion 1a has a plurality of large-diameter mounting holes 7 fixed to the insulating cylinder 5 of the electrode column 6 at equal intervals.
The lead wire take-out hole 8 with a smaller diameter
Individually drilled. That is, the insulating cylinders 5-the collector electrode 1-the insulating cylinder 5-the collector electrode 2-the insulating cylinder 5 are stacked in this order. The creepage distance of the cylinder 5 is set long. Although FIG. 5 shows only the collector electrode 1, the same applies to the other collector electrodes 2, 3, and 4.

[0004]

Increasing the creepage distance in the longitudinal direction of each insulating cylinder 5 of the electrode column 6 leads to an increase in the size of the collector structure, and the weight of the collector structure becomes very heavy. ..

The present invention has been made to solve the above-mentioned inconvenience, and prevents the increase in weight while making the creeping distance of the electrode support column sufficiently long, and is excellent in the withstand voltage performance and of a compact and lightweight microwave tube. It is an object to provide a multi-stage collector structure.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a part of a plurality of electrode columns for electrically insulating and holding a plurality of collector electrodes holds at least one of the plurality of collector electrodes. Is a multi-stage collector structure of a microwave tube which holds the collector electrodes of the above, and the other electrode columns hold the remaining collector electrodes.

[0007]

According to the present invention, the creepage distance of the electrode pillars supporting the collector electrodes can be sufficiently maintained without increasing the weight, and as a result, the withstand voltage between the collector electrodes is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. The embodiment shown in FIG. 1 is an application of the present invention to a helix type traveling wave tube, and is configured as follows.

That is, reference numeral 11 in the figure is a connecting end plate connected to a high frequency acting portion (not shown), and a collector supporting disk 13 is provided on the connecting end plate 11 via a high thermal resistance vacuum bellows 12. A plurality of, for example, six molybdenum support bars 14, 14 ... Are provided in a circle shape at equal intervals. A plurality of, for example, three insulating cylinders 15, 16 are provided on the outer periphery of the molybdenum support rods 14, respectively.
17 is fitted, and the fixing nut 1 together with the heat transfer support plate 18
It is fixed by 9. In this embodiment, on the outer periphery of the molybdenum support rod 14 on the left side of the drawing, insulating cylinders 17 and 16 having a relatively long dimension and an insulating cylinder 15 having a relatively short dimension are fitted and laminated from the bottom, On the outer periphery of the molybdenum support bar 4 on the right side, a short insulating cylinder 15 and long insulating cylinders 16 and 17 are fitted and laminated from the bottom, and the order is different. In this way, two types of three electrode columns 17
a and 17b are provided alternately. Collector support plate 1
A funnel-shaped heat shield 20 made of stainless steel is fixed to 3 and coaxially with this heat shield 20, funnel-shaped first, second, third and fourth collector electrodes 21, 22 made of molybdenum.
23, 24 and the bottom electrode 25 of the fourth collector electrode 24 are arranged in series from the upstream side to the downstream side of the electron beam at a predetermined interval, and the respective flange portions 21a, 22a, 23a, 24a are provided on the electrode columns 17a, 17b. It is fixed and held.

In this case, the first collector electrode 21 is constructed as shown in FIG. 2, three through holes 26 are formed in the flange portion 22a at equal intervals, and three support holes 27 are formed.
Holes at equal intervals, and four lead wire extraction holes 2
8 is drilled. The size of each hole is reduced in the order of the through hole 26, the support hole 27, and the lead wire extracting hole 28. The size and arrangement of these holes are the same in the third collector electrode. On the other hand, the second collector electrode 22 has three through holes 26 and 3 as shown in FIG.
The individual support holes 27 are formed in a positional relationship opposite to that of the electrodes of FIG. The size and positional relationship of these holes are the same for the support plate 24a of the fourth collector electrode 24.

The first, second, third, and fourth collector electrodes 21, 22, 23, and 24 are formed into insulating cylinders 15, 16, and
It is sandwiched and fixed between the 17 members. Therefore, as is apparent from FIG. 1, among the six electrode columns, three electrode columns 17a and 17b are the first and third collector electrodes 21,
23 is fixed at the position of each support hole 27, and penetrates each through hole of the other second and fourth collector electrodes 22 and 24 in a non-contact manner. On the other hand, the second and fourth collector electrodes 22 and 24 are provided in the support holes 2 in the remaining three electrode columns 22a.
Fixed at position 7 and adjacent first and third collector electrodes 2
Each of the through holes 1 and 23 penetrates without contact. Incidentally, FIG.
Reference numeral 29 therein indicates a vacuum envelope of the collector.

In the above embodiment, the number of collector electrodes is four, but it can be applied to a multi-stage collector having more collector electrodes. Further, the electrode columns of the collectors of each set are not limited to supporting or passing through every other collector electrode in a non-contact manner, but may be every other two, for example, every other one, every two or three combinations. You can Therefore, the number of electrode columns is not limited to two, and more combinations may be used. However, it is preferable that the number of electrode columns in each set is plural, and more preferably three or more, for stable support.

[0013]

According to the present invention, a part of the plurality of electrode columns which electrically insulate and hold the plurality of collector electrodes is a part of the electrode columns, and at least every other one of the plurality of collector electrodes is a collector electrode. Since the electrodes are held and the other electrode columns hold the remaining collector electrodes, the creepage distance of the electrode columns supporting the collector electrodes can be made sufficiently long, and as a result, the distance between each collector electrode can be increased. Withstand voltage is significantly improved. It also allows the axial length of the collector structure to be relatively short, resulting in a small, lightweight microwave tube.

[Brief description of drawings]

FIG. 1 is a sectional view showing a multistage collector structure of a microwave tube according to an embodiment of the present invention.

FIG. 2 is a plan view showing a collector electrode in the multistage collector structure of the present invention.

FIG. 3 is a plan view showing a collector electrode in the multistage collector structure of the present invention.

FIG. 4 is a cross-sectional view showing a conventional multistage collector structure of a microwave tube.

FIG. 5 is a plan view showing a collector electrode in a conventional multistage collector structure.

[Explanation of symbols]

15-17 ... Electrode columns, 21-24 ... Collector electrodes, 2
9 ... Collector envelope.

Claims (1)

Claim: What is claimed is: 1. A multi-stage collector for a microwave tube, wherein a plurality of collector electrodes arranged in series are electrically insulated from each other and held by a plurality of electrode columns in a collector envelope. In the structure, some of the plurality of electrode pillars hold at least every other collector electrode of the plurality of collector electrodes, and the other electrode pillars hold the remaining collector electrodes. The multi-stage collector structure of the microwave tube, which is characterized in that